At the level of the first rib, the lower cervical nerve roots combine to form the 3 trunks of the brachial plexus. The lowest trunk is formed by the union of C8 and T1, and this trunk lies ...

Numbness, tingling, and a feeling of weakness may accompany the complaint of pain, and, if of cervical origin, it can be expected to be in the distribution of the affected nerve root (Figure 12).